I am sure everyone has noticed that water wells have vastly different water levels, both while static and pumping. These differences are due to formation pressure.
Sometimes the pressure will be high enough that the well flows at surface. Usually this can be traced to the area of recharge. For instance, the Ogallala Aquifer, which spans the western plains from north Texas to the Dakotas, receives most of its recharge from snow melt on the east side of the Rockies, which are a much higher elevation. When this aquifer was discovered, wells in many places flowed due to high formation pressure. This bonanza irrigated crops on the Great Plains for over 100 years. After long and sustained use, water levels dropped so much that pumps had to be set deeper, and wells deepened, to reach the water. This is due to declining formation pressure.